Synchronize chapter and navigation translations with Chinese prose indentation

pipeline/01_preprocess.py

@@ -9,6 +9,7 @@ sys.path.append(os.path.abspath(os.path.join(os.path.dirname(__file__), "..")))
 
 from src.preprocessing.epub_cleaner import EpubCleaner
 from src.preprocessing.text_extractor import FineGrainedExtractor
+from src.preprocessing.navigation import prepare_navigation
 from src.translation.manifest_manager import ManifestManager
 from src.common.data_model import BookStructure
 from src.common.utils import setup_logger, ensure_directory
@@ -48,6 +49,8 @@ def run_preprocess(args):
         logger.info("Extracting text segments...")
         extractor = FineGrainedExtractor()
         entries = extractor.extract(structure)
+        prepare_navigation(input_path,structure,entries)
+        structure.save(structure_path)
         
         # 3. Update Manifest
         logger.info(f"Updating manifest: {manifest_path}")